Joe, that billboard is quoting the King James Version of the Bible (Romans 6:23 to be exact), and in any case it’s not vandal-worthy: “Wages” is one of those odd words that can be used with a singular or plural verb.

You asked: “does putting up a sign only tempt vandals to try it out?” Since this comment thread has already found its way to the book of Romans, I’ll note that the Apostle Paul would answer “yes” to your question (if you’re interested, see chapters 5 and 7 of Romans)…

If you want additional proof, watch any expanse of grass guarded by a “Keep off the grass” sign!

I’m sorry to correct the author of this article, but the sign is not redundant. It’s more like a double negative. Although I agree with furpurrson in that the insertion of hyphens at different permutations changes the meaning, the most obvious meaning is that the paint is resistant to being resistant to vandals. In other words, the sign makers are on the vandals’ side! Yay!